Bishop Athenagoras, néYves Peckstadt, was born on the March 24, 1962, in Ghent, Belgium, the son of Archpriest Ignace Peckstadt (who served there in Ghent) and Marie-Thérèse Janssens. After some years of law school at the University of Ghent, he began study at the University of Thessaloniki in Greece, having received a scholarship granted by the Ecumenical Patriarchate. He successfully graduated with a Master's degree in Theology. He continued his studies at the Ecumenical Institute of Bossey (University of Geneva), graduating with a thesis entitled History of Orthodox presence in Benelux and its importance to the ecumenical movement.

For more than five years he functioned as religion teacher in different high schools in Flanders. At the beginning of 1994, Metr. Panteleimon named him as producer for the Belgian radio and television Orthodox broadcasts in French and Flemish. In the same year, the Holy Synod of the Ecumenical Patriarchate made him a collaborator of the newly established Liaison Office of the Orthodox Church to the European Union, located in Brussels. By 1995, Archdeacon Athenagoras had founded with the blessing of Metr. Panteleimon an Orthodox parish in Bruges, under the patronage of the Ss. Constantine and Helen, where he served as the first dean. He functioned as Orthodox Chaplain of the International Airport of Brussels since several years, and is also a member in the Concertation of Christian Churches in Belgium, in the committee "A Soul for Europe," and president of the E.I.I.R. (International and Interconfessional Association for Meetings of Monks and Nuns), after serving as President of the Interecclesiastical Committee of Brussels.

He speaks Flemish, Greek, French, English, and German fluently.

On the May 13, 2003, he was unanimously elected by the Holy Synod of the Ecumenical Patriarchate of Constantinople as auxiliary bishop to the Metropolitan of Belgium with the ancient title of Bishop of Sinope, and was consecrated on Sunday, June 22, 2003, in the Orthodox cathedral in Brussels. In addition to his episcopal functions, Bp. Athenagoras continues to carry on most of his former duties.